s390/ipl: Fix NULL deref in kdump without re-IPL parm block
CVSS score
—
EPSS probability
%0.2
Risk score
—
Published
4 d ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
A NULL pointer dereference vulnerability exists in the Linux kernel's s390/ipl component during kdump operations when a re-IPL parameter block is missing. This occurs because certain IPL types do not provide a parameter block and os_info updates were made unconditional.
This vulnerability can affect the dump collection process during system crashes on the s390 architecture, potentially leading to instability or unexpected behavior under specific boot configurations.
What should be done?
- Follow vendor advisories and apply updates
- Ensure the os_info update is skipped when no re-IPL parameter block is available
Chain of evidence and sources
Bazı IPL türleri IPL parametre bloğu sağlamaz ve reipl_block_actual NULL kalır.
os_info güncellemesinin koşulsuz hale getirilmesi set_os_info_reipl_block() fonksiyonunun NULL pointer dereference yapmasına yol açar.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: s390/ipl: Fix NULL deref in kdump without re-IPL parm block Some IPL types, like HMC FTP boot or QEMU direct kernel boot, might not provide an IPL parameter block. In this case, reipl_type_init() selects IPL_TYPE_UNKNOWN, and reipl_block_actual remains NULL. kdump passes the re-IPL parameter block to the dump kernel through os_info. Before commit 3b9678472bab ("s390/ipl: correct kdump reipl block checksum calculation"), the os_info entry was added only for IPL types which initialized reipl_block_actual. That commit moved the os_info update to machine_crash_shutdown(), making it unconditional. As a result, set_os_info_reipl_block() dereferences reipl_block_actual for IPL_TYPE_UNKNOWN. This may happen to work by chance when address zero contains readable lowcore data and the resulting empty os_info entry is ignored by the dump kernel. Skip the os_info update when no re-IPL parameter block is available. Kdump then collect the dump and reboot without setting re-IPL parameter block.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
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Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98400 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98400 weaknesses.
Official Sources and Advisories
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